An Omaha sinkhole went viral. Hundreds of others fall under the radar.

As Harmon Maher walked along the Keystone Trail in central Omaha one morning in February, he spotted something odd: The creek next to the path, normally a gray-green color, ran bright orange. It was full of sediment, probably from some construction upstream, the retired geology professor reasoned. Maher didn’t think much of it until hours [...]